icinga-web.spec: bump to 1.8.2, add -nagios-bp, fix php53 requirement on el5

+* Thu Feb 15 2013 Michael Friedrich <michael.friedrich@netways.de> -
1.8.2-2
+- fix rpmlint errors/warnings
+
+* Wed Feb 11 2013 Markus Frosch <markus.frosch@netways.de> - 1.8.2-1
+- bump to 1.8.2
+
+* Wed Feb 06 2013 Michael Friedrich <michael.friedrich@netways.de> -
1.8.1-3
+- fix php5-pear reqs
+- fix php5-dom (suse), php-xml (rhel) and other missing/faulty reqs
+
+* Fri Jan 25 2013 Christian Dengler <christian.dengler@netways.de> -
1.8.1-2
+- add BuildRequires; add subpackage for nagiosbp